Illumination Does Not Come On Or Cannot Dim

Trouble symptom: 

Even when the lighting switch is operated, the illumination does not come on. Even when the illumination control is operated, the illumination does not dim.

Trouble symptom: 

Open circuit in illumination circuit

Wiring diagram: 

Clearance Light and Illumination Light System Ref. to WIRING SYSTEM>Clearance Light and Illumination Light System>WIRING DIAGRAM .

Fig 1: Illumination Light System Wiring Diagram (NO Illumination Dim)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK ILLUMINATION. 

   Make sure that all illuminations except A/C come on.

   Do other illuminations come on?

   • Yes  : Go to 2. 
   • No  : Check the illumination circuit. Ref. to LIGHTING SYSTEM>Clearance Light and Illumination Light System>INSPECTION .
2. CHECK CONNECTOR. 

   Check for poor contact of connector.

   Is the check result OK?

   • Yes  : Go to 3. 
   • No  : Repair the connector.
3. CHECK HARNESS (OPEN CIRCUIT). 
   1. Turn the lighting switch to ON.
   2. Using a tester, measure the voltage between the A/C control panel connector and chassis ground.

      Connector & terminal 

      (i88) No. 37 (+) - Chassis ground (-):

   Is the voltage 10 V or more? 

   • Yes  : Go to 4. 
   • No  : Repair or replace the open circuit of harness.
4. CHECK HARNESS (OPEN CIRCUIT). 
   1. Turn the lighting switch to OFF.
   2. Measure the resistance between A/C control panel connector and body integrated unit connector.

      Connector & terminal 

      (i88) No. 35 - (i84) No. 16:

   Is the resistance less than 10 Ω?

   • Yes  : Go to 5. 
   • No  : Repair or replace the open circuit of harness.
5. CHECK A/C CONTROL PANEL UNIT. 

   Check the A/C control panel. Ref. to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Control Panel>REMOVAL .

   Is the check result OK?

   • Yes  : A/C control panel illumination circuit is normal.
   • No  : Replace the A/C control panel. Ref. to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Control Panel>REMOVAL .